Fountain pen



E. H UG ETZ FOUNTAIN PEN July 18, 1933.

Filed May 11, 1932 [zzvenfanr Xxx/111266299;-

Jab/1 4 M Patented July 18, 1933 EDWABD'HUGETZDF YOR my. 1

rreo STATES. rareu nan FoU'NrAIN PEN Application filed May 11, 1932, Ser1a1- No.

sac has heretofore'been throughout of'a size corresponding to the smallest inner diameter .15 of the barrel. If the fountain pen'holder carries a pressure lever acting upon the ink sac there must be space for the lever and besides for the spring pressure bar resting there-' between; therefore 1n such case thediameter of the rubber ink sac has been made uniform- 1y of such a small diameter that said inter-f mediate space was produced. In this Way with the known fountain pens there has-been lost a great deal of ink capacity.

According to the present invention, this drawback is overcome thereby that the ink sac is not shaped uniformly .cylindrical throughout, but is adapted exactly to the shape of the inside of the fountainpen barrel.

In consequence thereof the. inksao for such fountain pen barrels wh1ch have a screw thread projection projecting into the inside of the barrel, have at. this place an annular narrowing, whereas the parts of the ink sac being above and underneath the'screw thread projection are of a larger diameter and possibly fill out all the space of the inside of the fountain pen barrel. And with the fountain pen holders with a pressure lever the diameter 3 of the ink sac isreduced only in its'upper end located next to the pressure lever and is enlarged again below the pressure lever to such an extent that itagain completely fills the lower space of the fountain pen. By this ff use of the inside space of the fountain pen barrel it is possible tocreate the greatest possible space for ink storage. At the same time by varying the diameter of the ink sac the further essential advantage is attained thereby that the, relatively long ink In most of the known fountain pens.

610,651, and in France November 12,1931.

sac is subdivided into'several short parts, of whichr each ofi'ers a stronger resistance against deformation than the uniformly. long rubbersac. If, for instance, byrscr'ewing on of a cap,.the neighbouring end of ink sac has the tendency-to. turn with the capfs'uch turning isxeliminated witha subdivided ink sac, and it returns to its normalposition-much faster. v J 1 If inside the ink sacone of the known rigid air tubes is placed, it is of advantage to extend said tube to the narrowedi'part ofthe ink sac, which is about the middle. offtheink sac, thatthe air tubeis' not squeezed or damaged at the squeezing of the upper part ofthe '6 "ink sac. The air tube the same as theink sac can be made ofelasticmaterial and, can be. engaged with an inner: extension of t l 1e' pen section respectively upon the ink feed resting therein.- In this case the air tube can be longer without. danger of being damaged by the pressing action. t 1

At its upper end,itheair tube can be enlarged funnel like and be: fastened with its enlargement inside the ink sac. Forthe'jre- 3.5

turning of the ink from the upper-into the a v v lower part ofthe sac openings can be-pr'o-f V v1ded 1n the funnel-shaped enlargement;

The drawing showsseveral sample con; 'structions of the'invention. 4 -.80' Fig; lis alongitudin'alsectional'view-of a fountain pen with a cap screwed. on the threaded projection ;ofthe barrel,-' the narrowed part of the ink sac next to said projection and the rigid air tube located therein,-f l

Fig. 2 shows in longitudinal section, the same fountain pen with flexible air tube, the funnel like enlarged upper end of which is fastened inside to the ink sac and providedwith openings; Y e3 Thefountain pen holder (Fig. 1) consists in the known manner of. the lower part 1, into which is inserted the ink feed 2 carrying the writing pen 3. At its upper end the barrel has a screw thread projection pro ect1n g 111 509 1 thein'ner space of the barrel, upon which projection the upper barrel part 5 is screwed i on. J a

According to, the invention the diameter of the ink sac is not throughout so uniformly i small as the one ofthe threaded projection 4.

On the contrary the ink sac 6 is provided about its middle part with a restricted part 7, so that thespaces of the barrel having a larger diameter belowand above the threaded projection are better utilized and each single short part of. the sac-especially the upper one'offe rs a greater resistanceagainstdeformatlon or distortion and if one portion of such a subdivided sac is subjected to pressure it will assume its normal shape much quicker than a sac of the usual sac shape uniformly.

1 throughout.

The air tube 8 can be rigid as known; but in such case it is extended only to the restricted portion 7, so that it can not be squeezed or damaged at the squeezing of the upper part of the air tube.

According to Fig.2 both the air'tube 9 and the ink sac are made ofone piece of flexible material for instance caoutchouc and the lower end is slipped over the extension 10 of the ink feed 2. 'The-upper part of theair tube is provided with a funnel like extension 11' which extends intothe ink sac and is provided with openings 12 through which, if necessary,theink can reflow from the upper into the space 6.

" At the squeezing of the upper part of the inksao the air in the sac is expelled through the'air tubes 8 and 9. On releasing the ink Jsac sucks'up the ink. This operation is re- What is claimed:

peated until the sa'c'is'sufiiciently filled.

1'. Afountain pen comprising 'an ink sac in its barrel having a restricted circumferential portion intermediate its'ends the upper v part of'said ink sac adapted for manual compression aftertheiremoval of the capavoiding the use of pressure bars and leaving a 'wide open communication between the squeezng area and the lower part of-the sac to permitthe storage of a large quantity of ink in comparison to thesiz'e-of the barrel and the ready return of the sac to its normal shape after each compression and an air tube in said ink sac. I I

2. A fountain pen comprising an ink sac in tion thereof. 2

its barrel having a peripheral restricted part subdividing the ink sac into an upper and a lower part the upper part extending from the barrel for manual compression after the removal of the cap avoiding the use of pres sure bars, said ink sac parts leaving a wide open communication between the squeezing area and'the lower part of the sac, and of comparatively large areas for the reception of aquantity of ink surpassing the quantity of-ink available in pens having barrels of the same size, and a flexible air tube in said ink sac.

:3. A fountain pencomprising an ink sac in its barrel having a restricted portion intermediate its ends, andfa restricted lowerend formed wlth sald nk sacconstituting an air tube, said restricted portion provided with the feed, a funnel-shaped connection between the part of the ink sac above the restricted portion andsaidflexible tube, said funnelshaped connection having openings for returning lnk from the upper; portlon ofthe sac into its lower part.

1 6'. A- -fountain pen including its feed and comprising an ink sac 'in its barrel having a restricted portion intermediate its ends dividmg saidsac into a comparatively wide upper and lower portion, a restricted flexible air tube adapted to be drawn over the inner end 'ofsaid feed, a connection' having a plurality of openings connecting the flexible tube with the upper portion of the ink sac, said openings permitting the flow of ink from the upper portion of the sac intothe lower por- EDWARD HUGETZ. 

